Seems like I remember a thread on this group a few years ago which suggested Round-up. I used it, with the only side effect being some occasional distorted blooms. Seemed to be OK for cleanup of the periphery, but drenching the clump might not be advisable. I used solely on TB's, don't know about the more petite forms.
George
-----Original Message-----
>From: IrisladyLJobe@aol.com
>Sent: Mar 25, 2012 1:33 PM
>To: iris@hort.net
>Subject: Re: [iris] Culture-weed killer that does not kill iris
>
>No, Stinger kills weeds
>
>Leslie
>
>
>In a message dated 3/25/2012 12:32:07 P.M. Eastern Daylight Time,
>lmann@lock-net.com writes:
>
>From what I've read, I don't think Stinger kills grass. Never used it
>myself.
>
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